Posted: 8/23/2015 4:47:13 PM EDT
| I recently purchased the AR9 complete lower and upper, with an unramped bolt. I assume the lower has a standard hammer in it. The bolt is very hard to charge and close. Do I need a 9mm hammer or What should I do to get it running properly? Any help would be greatly appreciated. |
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Quoted:
I recently purchased the AR9 complete lower and upper, with an unramped bolt. I assume the lower has a standard hammer in it. The bolt is very hard to charge and close. Do I need a 9mm hammer or What should I do to get it running properly? Any help would be greatly appreciated. Have you tried shooting it yet? Sometimes new parts are just tight and they break in together. Try shooting it and if you have problems see what they say. |
| you have a rounded hammer this is what the industry considers a "9mm hammer" some companies may bob the back off, some may coat them in sparkles, but at the end of the day the face will be "rounded" just like what you have. run a couple hundred rounds of some thing like winchester white box (cheap and reliable) through it, if you continue to have problems or just feel the need to be uber tactical than send the bolt off to be "ramped". some guns just take a few more rounds to break in and be reliable. |
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That is absolutely NOT a 9mm hammer. That is a standard AR-15 hammer.
And ramping the bolt has nothing to do with being "uber tactical". It is to prevent breaking the hammer pin or, even worse, egging out the hammer pin holes on the lower receiver, both of which are well-documented problems with the combination of an unramped bolt and a standard AR-15 hammer. |
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That is absolutely NOT a 9mm hammer. That is a standard AR-15 hammer. And ramping the bolt has nothing to do with being "uber tactical". It is to prevent breaking the hammer pin or, even worse, egging out the hammer pin holes on the lower receiver, both of which are well-documented problems with the combination of an unramped bolt and a standard AR-15 hammer. No that's not a 9mm hammer but it should work. The AR-15 hammer that gave issues with unramped carriers was the old "semi-auto" hammer with the notch out of the top back when semi auto carriers were the norm. The hammer the OP has is what used to be called the "DPMS " hammer and is closer to the M16 profile (just without the hook on the tail). That said I found my 9mm ran better with the specific 9mm hammer even though it would also work with the hammer style the OP has. It wouldn't run at all with the old style AR-15 hammer. |
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Oh it'll work, since it's not notched. The question is, for how long? An unramped bolt contacts the hammer at a point closer to the pin than on a regular AR-15, and this increases the force applied to both the hammer pin and the lower receiver.
If you look at a 9mm hammer, you'll see they've "ramped" the hammer face to make up for the lack of a ramped bolt. Seems to me the better solution is just to ramp the bolt (like a standard AR-15) and use a standard unnotched AR-15 hammer. |
I got my AR9 running great. I had Mad-Machinist ramp my bolt for me, added KNS pins, and removed some of the material from the ejector. I put my colt double heat shield handguards on it and a primary arms advanced micro dot. I really like it so far, probably my favorite range gun. Thank you everyone for the help.
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Quoted:
I got my AR9 running great. I had Mad-Machinist ramp my bolt for me, added KNS pins, and removed some of the material from the ejector. I put my colt double heat shield handguards on it and a primary arms advanced micro dot. I really like it so far, probably my favorite range gun. Thank you everyone for the help. http://i1254.photobucket.com/albums/hh608/fullmedaljacket8/20150907_154325_zpsywyitufn.jpg http://i1254.photobucket.com/albums/hh608/fullmedaljacket8/20150907_154302_zpsqi9clptf.jpg What mag pouch is that? |